As的用法

As的用法小结

As可以作连词、介词及关系代词和副词。现将其用法小结如下: （一）、As作连词的用法:

1. 引导时间状语从句，作“当．．．的时候”解，有“随着．．．”之意，与while意义相近，强调两个动作同时发生；或某事一发生，另一事立即发生。eg：

He shouted aloud as her ran along．他一边往前跑，一边高声地呼喊。

I was startled as he opened the door．他一开门，我吓了一跳。

as作连词，相当于when。eg；

As a little boy (When he was a little boy)he began to learn to play piano．他小时候就开始学弹钢琴。

As与When、While的比较

作“在-------期间，当----的时候”引导时间状语从句.注意与when、while的用法区别。

①下列情形时,只用as, 而不用when或while。

1)用于表示同一个人的两种动作交替进行,指一边----一边. 如:

The girl sings as she goes to school.

He looked behind occasionally as he went forward in the forest.

2)表示两个同步发生的动作或行为,意思是随着-----的发展.如:

As children get older, they become more and more interested in everything.

As the sun rose the fog dispersed.

太阳一出来,雾随之消失。

3)表示两个短暂行为或事情几乎同时发生.如:I watched her as she read the book.

I thought of it just as you opened your mouth.

4)接在名词后面表示某一个年龄段时.如:

As a young man, he was active in sports.

②when作"当……的时候"解,可以指较短的(一点)时间,也可指一段时间。如:When I was at college, I could speak several foreign languages.

When the clock struck twelve, I had slept for 2hours.

③while常表示一段较长的时间或一个过程,强调主句谓语动词与从句谓语动词同时发生。如:Work while you work. Play while you play.

2.引导原因状语从句,As =Since 作"既然"、"由于"解,常用来表示已为人们所知或显而易见的原因或理由。如:

I must stop writing now，as I have rather a lot of work to do．

我必须停笔了，因为我还有许多工作要做。

We didn't know what to do as we were just visiting there.

我们不知道该怎么办,因为当时我们仅仅在那里作访问。

3.引导方式状语从句，As =in the way that作"像"、"按照……的方式"解,。如:

Do as I told you.

As in your country，we grow wheat in the north and rice in the south．

正如(像)你们国家一样，我们在北方种小麦，在南方种大米。

When at Rome，do as Romans do．入乡随俗。

4.引导比较状语从句，用于as--- as或not / so/ as ---- as中,前一个as是副词,后一个as 是连词,。

如:They helped the old as much as possible.

I don't speak English so/ as well as she does.

5.引导让步状语从句,表示虽然,尽管等,常用倒装语序,即把从句中的表语、状语或动词原形放在as之前。模式为:

adj. /adv. / n.+as +主语+谓语+主句。

如: Strange as it may seem，it is true．

尽管这事看上去很奇怪，但却是真的。

Try as he might，Tom could not get out of the difficulties．

不管怎样努力，汤姆还是摆脱不了困境。

6.表示也------一样。

She is a doctor, as was her husband.

7．像...一样;依照;像例：You ought to do as Paul tells you.

你应按照保罗吩咐的做。

The work is not so difficult as you imagine. 这工作不像你想像的那么困难。

（二）、As作关系代词，引导定语从句

1.(与such,the same,as等连用,引导关系从句)与...相同的事物(或人)

例：He has earned as much money as I have.

他赚的钱和我赚的一样多。

例：She felt just the same as he did.

她和他的感受相同。

2.(引导从句,对前述内容作补充)本情况,该事实

例：She has married again, as was expected.

她已再婚,这是意料中的事。

例：We are tired, as anyone can see.

我们累了,这是有目共睹的。

（三）、As作介词的用法.

1.表示好像。

如:He dressed as a policeman.

The old woman was dressed as a young lady.

这位老妇人打扮得像一位年轻人。

2. 表示作为当作。

如：I found a job as a guide.

She didn't think much of him as a painter.

她对他作为一位画家评价不高。

3. 当某人是某身份时；作为,以...的身份。

如：As a child , she was sent to abroad.

She works as an interpreter in that company.

她在该公司里担任翻译员。